Don't take it from us, though -- this is coming from the MMA coach you've seen Joe in videos with, Eric Nicksick.

"If you win a game and identify yourself as a winner, that's dangerous," said Mazzulla.

"I don't think you can ... make someone do something that they don't want to do," he explained.

"You can go through life and situations emotionally, and operate by feeling and you end up on autopilot," suggested Mazzulla.

How Celtics head coach Joe Mazzulla's response to Brad Stevens' Jaylen Brown trade with the 76ers is very telling.

The Boston Celtics are navigating one of the most eventful offseasons in recent memory. The Jaylen Brown trade has dominated the conversation, and the roster is taking shape around a healthy Jayson ...

The Boston Celtics will begin their 2026-27 season with a trip to the Detroit Pistons on October 20.Joe Mazzulla’s team, which has undergone significant change this summer, will look to hit the ground ...

Boston Celtics head coach Joe Mazzulla is a longtime Brazilian jiu-jitsu practitioner, and he won't let the throes of travel stop him from training during the NBA season.

INDIANAPOLIS — After the Celtics lost to the Spurs on Saturday night, Jaylen Brown launched into a lengthy, expletive-laced rant to voice his displeasure about not being awarded a free throw in the ...

BOSTON, MA – Boston Celtics head coach Joe Mazzulla was named the NBA Eastern Conference Coach of the Month for games played ...

All the stats, projections, and numbers in the world cannot erase the sting of trading a guy like Brown. But when you take a step back and push emotions aside for a moment, it becomes clear: The ...